Stay secure with the latest email security updates, best practices, and threat alerts to protect your inbox and sensitive information.
Search across headline titles and summaries.
Background for this topic.
Email is a system for exchanging digital messages, typically using mail servers and clients over a network. In security, it includes both the messages and the accounts, servers, domains, and authentication mechanisms that handle them. Email commonly carries phishing links, malicious attachments, and fraudulent requests for payments or credentials; compromised accounts can also be used to impersonate trusted people and conduct further attacks.
Defenses include filtering and malware scanning, phishing-resistant multifactor authentication, careful handling of links and attachments, and monitoring for unusual login or sending activity. Domain controls such as SPF, DKIM, and DMARC help receiving systems detect messages that are forged or sent without authorization, while encryption protects message contents in transit or at rest when correctly implemented. Security teams should preserve relevant headers and mailbox activity so suspicious messages can be investigated, removed, and used to identify affected accounts and other recipients.
Microsoft confirmed that the KB5074109 January Windows 11 security update causes the classic Outlook desktop client to freeze and hang for users with POP email accounts. [...]
Cisco finally patched a maximum-severity AsyncOS zero-day exploited in attacks targeting Secure Email Gateway (SEG) appliances since November 2025. [...]
Cisco on Thursday released security updates for a maximum-severity security flaw impacting Cisco AsyncOS Software for Cisco Secure Email Gateway and Cisco Secure Email and Web Manager, nearly a month after the company disclosed that it had been exploited as a zero-day by a China-nexus advanced persistent threat (APT) actor codenamed UAT-9686
Google has confirmed that it's now possible to change your @gmail.com address. This means that if your current email is [email protected], you can now change it to [email protected]. [...]
Cloud marketplace and distributor Pax8 has confirmed that it mistakenly sent an email to fewer than 40 UK-based partners containing a spreadsheet with internal business information, including MSP customer and Microsoft licensing data. [...]
Security Experts See Coincidental Timing After Leak of Scraped Instagram User DataInstagram said a massive wave of password reset emails sent to its users traced to malicious abuse of a legitimate feature, but didn't result from any breach of its systems. Separately, security experts said a threat actor leaked 6.2 million users' email addresses, among other account information.